Duncan at genesis watches gets a lot of good feedback from other forum members and his prices are around £300. He can even take pictures of your watch as he does the work and send you them for updates and proof.
Also another guy called john senior at
http://www.obsoletewatchandclockparts.com
I've never dealt with them personally but emailed both about servicing.
John is cheaper and I think mainly does vintage pieces but worth asking both
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